YUANNENGJI LED nggunakake fosfor kanggo jas chip LED kanggo entuk emisi cahya putih.
Ana telung cara utama kanggo LED nggunakake fosfor kanggo entuk emisi cahya putih, nanging ora ana sing diwasa kanthi lengkap, sing akeh mengaruhi aplikasi LED cahya putih ing lapangan cahya. khususe, cara pisanan kanggo jas chip LED biru karo fosfor kuning sing bisa bungah dening cahya biru, lan cahya biru sing dipancarake chip nglengkapi cahya kuning sing dipancarake fosfor kanggo mbentuk cahya putih.. Teknologi iki dimonopoli dening Nichia Corporation Jepang, lan kerugian dhasar saka solusi iki yaiku spektrum emisi ion Ce3+ ing fosfor ora nduweni karakteristik spektrum sing terus-terusan., rendering werna miskin, lan angel kanggo nyukupi syarat cahya suhu warna sing kurang. Ing wektu sing padha, efficiency luminous ora cukup dhuwur, lan perlu ditingkatake kanthi ngembangake fosfor efisiensi tinggi anyar.
Cara implementasine kaping pindho yaiku nglapisi fosfor ijo lan abang ing chip LED biru, lan cahya biru sing dipancarake dening chip disintesis karo cahya ijo lan abang sing dipancarake dening fosfor kanggo entuk cahya putih kanthi rendering warna sing luwih apik.. Nanging, efisiensi konversi efektif saka fosfor digunakake ing cara iki kurang, utamané efficiency saka fosfor abang perlu nemen apik.
Cara katelu yaiku kanggo nutupi kain ungu utawa ultraviolet chip LED karo telung werna utami utawa fosfor multi-werna, lan nggunakake sinar ultraviolet gelombang dawa (370nm-380nm) utawa cahya ungu (380nm-410nm) dipancarake dening chip kanggo excite phosphors kanggo entuk emisi cahya putih. Cara iki nduweni rendering warna sing luwih apik, nanging uga duwe masalah sing padha karo cara liya. Ing saiki, fosfor abang lan ijo kanthi efisiensi konversi sing luwih dhuwur yaiku sistem sulfida. Fosfor jinis iki nduweni stabilitas luminescence sing kurang apik lan bosok cahya sing gedhe. Mulane, iku wis dadi prioritas ndhuwur kanggo berkembang dhuwur-efficiency lan kurang cahya bosok cahya putih phosphors LED.
Nggunakake fosfor kanggo nggawe LED warna nduweni kaluwihan ing ngisor iki:
Kaping pisanan, senajan werna LED saka macem-macem werna kayata abang, kuning, ijo, biru, and purple can be prepared without using phosphors, the luminous efficiency of these different color LEDs varies greatly. After using phosphors, the advantages of high luminous efficiency of LEDs in certain bands can be used to prepare LEDs in other bands to improve the luminous efficiency of the band. For example, some green band LEDs have low efficiency. Taiwanese manufacturers use the phosphors we provide to produce a high-efficiency LED called apple green for mobile phone backlights, which has achieved good economic benefits.
Kapindho, the emission wavelength of LEDs is still difficult to control accurately, which will cause some wavelengths of LEDs to be wasted because they cannot be used. For example, when a 470nm LED is needed, an LED with a wider range of 455nm~480nm may be produced. The LEDs at both ends of the emission wavelength can only be processed or discarded at a relatively low price. The use of phosphors can convert these so-called waste products into the colors we need for our use.
Third, after using phosphors, the light color of some LEDs will become softer or brighter to meet different application requirements. Of course, phosphors are most widely used in the field of white light on LEDs, but due to their special advantages, they can also be used in color LEDs to a certain extent. Nanging, the application of phosphors in color LEDs has just started and requires further in-depth research and development.